Rear derailleur hanger alignment tools - recommendations?

[Harpoon]

Has anyone got one of these in their home toolbox?

A Park DAG 2.2 is around £65, the DAG 3 around £100. The Abbey version looks lovely but so it should be for over £200. However, Amazon has a random assortment of unknown Chinese brands from £25 - can anyone recommend one they have?

As background, the drivetrain on my winter bike self destructed back in November 2024. I think I posted a picture in the "Photo's from today's ride" thread but I'm not sure what started the disaster. End result was a sheared hanger, trashed rear mech (I never found the jockey wheels and cage) and a snapped + bent chain.

I got all the bits in to fix it but then life got in the way. This where having multiple bikes is a very good idea, as I kept riding other bikes. Over the past week I've finally got round to sorting it. However, having replaced all the items below with brand new ones, I can't get the shift from smallest to next smallest on the back spot on.

• Rear mech' hanger
• Full cable outer from the shifter to the rear mech
• Gear cable
• Cassette
• Chain
• Rear derailleur

I'm happy with the limit screws and cable tension as shifting across the rest of the cassette is spot on (for both front chainrings). If I shift up a single click from the smallest cog, it does shift quickly but is very noisy and the chain jumps. Normally at this point I'd just use the barrel adjuster on the mech to fine tune the position until the chain is quiet. However, there doesn't seem to be a sweet spot and as you continue to turn the adjuster, the chain starts to try to jump to the 3rd cog on the cassette. Back the adjuster off again and I end up with the chain trying to go down to the smallest cog again.

Thus I'm wondering if the new hanger or frame isn't straight. I've taken the hanger back off and inspected it - to my Mark I eyeball it looks good but could still be out. I could chuck the bike at the LBS but £30 on a no-name tool is probably cheaper. Heck, an hour's LBS labour these days is probably close to the Park version...

[frisbee]

I straightened the hanger of a friend's bike using a cheap tool after he had a low speed tumble.

I had never done it before, the gears were crap and impossible to setup before, a piece of piss to afterwards. The tool was crude but easy to work out how to use, I don't feel any urge to get a better one.